From owner-freebsd-questions  Sun Jul 23 17:16:44 2000
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Date: Mon, 24 Jul 2000 02:16:35 +0200
From: Siegbert Baude <siegbert.baude@gmx.de>
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To: Mike Smith <msmith@freebsd.org>,
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Subject: Re: No /boot/loader (dangerously dedicated)
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Mike Smith wrote:
> > > Actually, no.  Both of these controllers' firmware will read the on-disk
> > > geometry and prefer that.
> >
> > That's not true for all SCSI controllers.
> 
> It's true for the vast majority of those available today.  You're welcome
> to go look at their BIOS code and check it out yourself.

I'm afraid, my skills won't allow this. 

> Adaptec allow you a configuration option which mutates the selection of
> translation modes (there are actually three of them).  Both Adaptec and
> Symbios/LSI will read the first block off the disk and prefer the
> geoemtry there if they find a valid MBR that matches the disk.

It was in 1998 when I purchased my last SCSI-controller and I decided to
buy a Symbios one because of the above mentioned reason. So this is a
new piece of information for me, that Adaptec is now also able to do
this. Sorry.

> > The same can happen to (E)IDE-disks if the BIOSes of different
> > motherboards use different translation modes.
> 
> This is less of an issue with the EDD/EDD3 standard defining the
> traslation algorithms.

True for nowadays boards. Only some very old ones had trouble with this,
according to my experience.

Regards
Siegbert


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